Process for the production of varnish and enamel like coatings



I06. COMPOSITIONS,

20 before the addition of the water COATING OR PLASTIC.

Patented Nov. 10, 1931 UNITED STATES \JI Ubb HCIUI UIILE PATENT OFFICEALBERT JAEGEB, OF STADE IN HANOVER, GERMANY, ASSIGNOB TO HEROLD AKTIEN-GESELLSCHAFT, OF HAMBURG, GERMANY, A CORPORATION OF GERMANY PROCESS FORTHE PRODUCTION OF VARNISH AND ENAMEL COATINGS Ho Drawing. Applicationfiled July 2, 1929, Serial No. 375,575, and in Gerinany D e cember 28,1'527.

It is known to produce varnishes for the preparation of enamel likecoatings by combining the liquid phase which occurs first in thecondensation of phenol with formalde- 5 hyde, generally accompanied bystratification, with solutions of water-glass. If this is done merely byadding water-glass solutions to the liquid phase, then the silicic acidis precipitated. It has already been proposed to avoid this by addingsilicic acid, titanium dioxide or metal oxides before or at the sametime as the addition 'of water glass to the liquid condensation phase.

It has now been found that the precipitation of the silicic acid on themixture of the water-glass with the liquid phase of heno o rma ehvdecondensation ma a o, and even Etter, be prevented by ad mg a protectivecolloid to the mixture with or glass. As

rotective colloids, resin-esters cellulose es .ers, art-1 cia resins asswellmgs 0r solu- -qtions in organic solvents, albuminous substances.gelatlnous substances and the like may be added. The process may be pergformed, for instance, by dissolving the protective colloid in cresol,then adding the liquid phase and finally admixing the waterglass. Such amixture is then heated as a whole until a drop, brought on to glass,gives a brittle resin. The resins so obtained give coatings of enamellike hardness and tenacity. They dissolve in. the usual solvents, suchas alcohol, am 1 acetate solvents containing "IldlIlE. li dro 'enatedlienols, lactic acid esl-ers and e. e present many important because itpresents the possibility of utilizing waste, from the manufacture ofartificial ma- 40 ene s. w 1c was e o se ess. s protectlve colloid, forinstance, for the present process use may be made of casein waste, or ofsuch in the form of elalitE waste or finally of the waste from e ma'nu'ac ure of artificial resins or from the mechanical treat "r nent ofartificial resins; these may be swollen or dissolved, e. g. in cresol,and then admixed to the liquid phase of phenol formaldehyde condensationand finally waterglass added to the mixture.

The resinous products obtained by the practice of the present inventionare capable of hardening into tough, hard enamel like coatings which maybe improved after evaporation of the solvent by hardening atcomparatively low temperatures.

1 claim 1. Process for the production of varnishes capable of hardeningby. combining the liquid phase of phenol formaldehyde condensation withwater-glass, therein characterized that the combination of water-glasswith the liquid phase is performed in the presence of a protectivecolloid in a quantity sufiicient to prevent precipitation of silicicacid.

2. In the process of producing a varnishlike coating capable ofhardening, the steps comprising mixing w te with casein waste and addingthe mixture to the liquid phase of phenol-formaldehydecondensation saidcasein waste being used in a'quantity sufficient to preventprecipitation of silicic acid.

3. In the production of a varnish-like coating, the steps comprisingcombining water lass with the liquid phase of phenol formaldehydecondensation in the presence of a protective colloid selected from thegroup consisting of resin-esters, gel l ulose esters, artificial resins,albuminou'ssubstances, and

elatinous substances, the colloid being used in a suflicient quantity toprevent precipitation of silicic acid.

4. The process of producing a resinous coating composition comprisingmixing water glass in the presence of a protective colloid dissolved inan organic solvent with the liquid phase of phenol formaldehydecondensation, said colloid being used in a sufficient quantity toprevent precipitation of silicic acid, and heating the resulting mixtureuntil a mass is obtained capable of hardening into a resinous product.

7. DR. ALBERT JAEGER.

